cava bio 204 s1.d16 2.05 Ions in Living Things
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| An [...] is an atom with a positive or a negative electrical charge | An ion is an atom with a positive or a negative electrical charge
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| Cells use [...] to send electrical signals to each other. | Cells use ions to send electrical signals to each other.
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| When you ingest sodium chloride, you are ingesting an inorganic compound —it does not contain carbon. You are also ingesting an [-ic] compound. | When you ingest sodium chloride, you are ingesting an inorganic compound —it does not contain carbon. You are also ingesting an ionic compound.
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| One of calcium's most important roles is to help regulate the substances that cross cell [-s]. | One of calcium's most important roles is to help regulate the substances that cross cell membranes.
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| When [...] dissolves in water (or blood), it forms an acid called carbonic acid. | When carbon dioxide dissolves in water (or blood), it forms an acid called carbonic acid.
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| Bicarbonate ions serve as [-s] that keep the acidity at levels that cells can tolerate. | Bicarbonate ions serve as buffers that keep the acidity at levels that cells can tolerate.
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| [-s] are chemicals that resist a change in pH; either to more acidic, or more alkaline. | Buffers are chemicals that resist a change in pH; either to more acidic, or more alkaline.
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| The most familiar source of bicarbonate ions is probably sodium bicarbonate (aka [...]) | The most familiar source of bicarbonate ions is probably sodium bicarbonate (aka baking soda)
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| [...] ions (Na+) play an important role in balancing the movement of fluids into and out of cells. | Sodium ions (Na+) play an important role in balancing the movement of fluids into and out of cells.
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| In lesson 2.05, the k12 authors say, "Hold your arms out like a bird and flap them up and down. Don't worry, no one can see you! ".... how do they know no one can see you!? ARE THEY WATCHING YOU!??? ;-) | YES!!
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| The ruby-throated hummingbird can flap its wings approximately 65 times per [...]. | The ruby-throated hummingbird can flap its wings approximately 65 times per second.
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| In general, the larger an animal is, the [-er] it's heart beats and the smaller it is, the [-er]. | In general, the larger an animal is, the slower it's heart beats and the smaller it is, the faster.
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| -ide is a suffix we use in chemistry for [-ive] ions. Chlorine is an element, but Chlor-IDE is the [-ive] ion of Chlorine. | -ide is a suffix we use in chemistry for negative ions. Chlorine is an element, but Chlor-IDE is the negative ion of Chlorine.
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| Hydrogen [-s] play a large role in generating ATP, the 'battery' molecule that powers all the protein machines in cells. | Hydrogen ions play a large role in generating ATP, the 'battery' molecule that powers all the protein machines in cells.
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